TextBox validation problem

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In one of my textbox I wanted to compare for integer entry. I used Compare validator and Range expression validator as well. In the textbox, at the beginning if I enter a space using space
key, both the validators are not throwing error. It is accepting! Please advice for possible correction in my code or is there any possibility in C# by using the value of space bar ascii code. Following is my code for Compare validator and Range expression validator.

VB

<asp:CompareValidator ID="CompareValidator1" runat="server"
            Operator="DataTypeCheck"
            Type="Integer"
            ControlToValidate="TextBox14"
            Text="Text must be an integer." ForeColor="Red"
            style="z-index: 1; left: 90px; top: 22px; position: absolute; " />

XML

<asp:RegularExpressionValidator ID="RegularExpressionValidator31"
            runat="server" ControlToValidate="TextBox14" ErrorMessage="Enter an integer"
            Font-Size="X-Small"
            style="z-index: 1; left: 90px; top: 22px; position: absolute"
            ValidationExpression="[0.00-9.00]{1,7}"></asp:RegularExpressionValidator>

Posted 1-Feb-13 16:34pm

S.Rajendran from Coimbatore

Updated 1-Feb-13 17:39pm

v2

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fjdiewornncalwe · Accepted Answer · 2013-02-01T17:50:00

It is perfectly fine that the validation passes with leading or trailing spaces. The same thing would be ok if you attempted to run a TryParse or Convert on a numerical string with leading and/or trailing spaces. The numerical value is still valid, it just needs to be trimmed.

[Update]
When you postback your page and you want to work with the value in the Textbox as a numerical value, you would do something like this.

C#

// In the case you want an integer value.
int value;
if( Int32.TryParse( YourTextBox.Text, out value ) == false )
{
   // If the TryParse call fails to convert the value to an integer, 
   // set a default value here.
}

// In the case you want an double value.
double value;
if( Double.TryParse( YourTextBox.Text, out value ) == false )
{
   // If the TryParse call fails to convert the value to an double, 
   // set a default value here.
}